Abstract
We present inelastic neutron scattering measurements of magnetic excitations in stripe ordered Pr3/2Sr1/2NiO4 at T∼10 K. For the observed magnetic incommensurability ϵ=0.4, we have incorporated a stripe discommensuration model in our linear spin wave calculation and obtained best agreement with the measured spin wave dispersion, especially to explain the symmetrical outward shift of the magnetic peaks from Néel ordered zone center in energy range 35 to 45 meV. Our study indicates the prerequisite to consider a discommensurated spin stripe unit with proper out-of-plane and in-plane exchange interactions in between Ni2+ spins to describe the observed spin wave characteristics in Pr3/2Sr1/2NiO4.
| Original language | English |
|---|---|
| Article number | 147202 |
| Journal | Physical Review Letters |
| Volume | 124 |
| Issue number | 14 |
| DOIs | |
| State | Published - Apr 10 2020 |
| Externally published | Yes |
Funding
We would like to greatly acknowledge the support of M. Ceretti for providing us with good quality single crystal. We thank M. Opel for helping with the SQUID magnetometry measurements, J.T. Park for giving important tips during INS measurements at PUMA, and S. Ward for helpful discussion regarding the spinw code. A.M. would like to greatly acknowledge the support of G. Eckold for giving the opportunity to use internal neutron beamtime at the instrument PUMA at FRM II operated by Georg-August-Universitat Gottingen in cooperation with Technische Universitat Munchen.
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